1. R. Van Schmus, J. A. Wood, Geochim. Cosmochim. Acta, 31 (1967) 747.
2. F. Chayes, Petrographic Modal Analysis, J. Wiley, New York (1956).
3. S. A. Saltykov, Stereometric Metallography Metallurgizdat, Moskau (1958).
4. E. R. Weibel, H. Elias, Quantitative Methods in Morphology, Springer-Verlag, Berlin (1967) p. 89.
5. H. Giger, in Stereology. Springer-Verlag, New York (1967) p. 257.